diff --git a/templates/machine.m.motemplate b/templates/machine.m.motemplate
index 5e5984ce..db34071c 100644
--- a/templates/machine.m.motemplate
+++ b/templates/machine.m.motemplate
@@ -9,7 +9,8 @@
 @implementation _<$managedObjectClassName$>
 
 + (id)insertInManagedObjectContext:(NSManagedObjectContext*)moc_ {
-	return [NSEntityDescription insertNewObjectForEntityForName:@"<$name$>" inManagedObjectContext:moc_];									 
+	NSParameterAssert(moc_);
+	return [NSEntityDescription insertNewObjectForEntityForName:@"<$name$>" inManagedObjectContext:moc_];
 }
 
 - (<$managedObjectClassName$>ID*)objectID {